I spent over 5 years as a Business Specialist and here was my experience in a couple of stores:
Article is correct - former GAP, Target, Whole Foods, "insert similar company here" managers don't understand business at all. Why would they?
They were more concerned with store traffic and an "immediate win" than longer term, "strategic" relationship building with clients that spend more and more often. Business team members get pulled at the drop of a hat when the Red Zone was busy, even if it meant losing time to call/follow up with businesses that have expressed interest. Since Apple is so flush with cash a Store Leader has little incentive to run their store as if it was their own business (higher ups would rather care about AppleCare or OnetoOne sales).
The Retail business teams CAN have opportunity to drive a good portion of the store's business (15-20% while being 2-5% of staff) but it varies based on store and you guessed it, existing store leadership. Those in the thread saying it was just "business already walking into the store and thus NOT B2B" are both right and wrong. Over time I saw higher-ups push to re-define foot traffic as "business customers" in order to hit goals. This doesn't take away from legit relationships.
I went through 6 Business Managers during that time - most had no experience and would move on or move to a regular store role. Those that came in with related experience left quickly as the job wasn't what they were sold - mainly, trying to teach college kids how to develop leads from food traffic (easily 50%+ of the job).
The CRM system was horrible. The discounts offered to clients was poor (making those who were successful very impressive indeed - they had the deck stacked against them). And overall it seemed the business team existed as a unit fighting Apple itself for resources to succeed.
I left about 2 years ago. Good riddance.